HOBOKEN - Federal authorities have begun questioning aides to Hoboken Mayor Dawn Zimmer as they begin to investigate claims that members of the Christie administration tied the delivery of Superstorm Sandy aid to support for a real estate project, according to an NBC News report.

Authorities have also instructed several key witnesses to preserve all documents and emails relating to the allegations by Zimmer, the report said.

Mayor Dawn Zimmer said she was told by Lt. Gov. Kim Guadagno that the ultimatum came directly from Christie. Guadagno strongly denied those claims Monday and described them as "false" and "illogical."

"Any suggestion that Sandy funds were tied to the approval of any project in New Jersey is completely false," she said.

City council members voted last night to hire a lawyer as the investigation moves forward.